Malicious PDF — malware analysis report

Static analysis result for SHA-256 6705406fc4f04098…

MALICIOUS

PDF

42.9 KB Created: 2020-04-13 08:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2c6d6f37f371379dd7a3b85e9a2e8ced SHA-1: 1c2da64c49d620e2a657f68d0dfd3a6cac6e58fd SHA-256: 6705406fc4f040984124c17088118ccbcf6309804cb411ddd3f236a155ac8c05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links to external websites, many of which are structured as SEO link farms and point to other PDF files. The heuristic 'PDF_SEO_LINK_FARM' and the ClamAV detection 'Pdf.Dropper.Agent-9167587-0' strongly indicate malicious intent. The embedded URLs likely serve as a mechanism to download and execute further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Dropper.Agent-9167587-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9167587-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://mickwallis.com/uploads/1/3/1/3/131381717/131381717.html#honeywell+smart+thermostat+rth9585wf+review
    • http://photoboothrentalssanjose.com/uploads/1/3/0/7/130775610/guroku.pdf
    • http://intercessionmedia.com/uploads/1/3/0/2/130274017/vefoxu-kafizujokitik.pdf
    • http://diamondquickresponsecleaning.com/uploads/1/3/1/4/131453171/16eae7.pdf
    • http://toalias.com/uploads/1/3/0/7/130739269/d12b025f967a9e.pdf
    • http://freestatesolutions1.com/uploads/1/3/0/4/130435826/72cc4c.pdf
    • http://holistichealingandbeing.com/uploads/1/3/0/7/130739116/wulodasejasedu.pdf
    • http://guerassalsas.shop/uploads/1/3/0/9/130969759/3577183.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ad8.bin
0109871748ce8c4c9b3660b7972f269d7d078797cad9edc278435dcbde34aef1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD8 8372 bytes
font_01_sfnt_off00008b2c.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B2C 2616 bytes
font_02_sfnt_off0000945b.bin
a2f0e64d6975656d959a0794b9a965349b6a87240c16eb122ddb64596f86590d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x945B 1704 bytes

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